The Eclipse Replay Keychain has an 1.8 inch touch screen that lets you navigate your media easily and never be at a loss for storage with the microSD slot! This piece is the ultimate on-the-go media companion with a clip-on style. Audio Output - 3.5mm audio headphone jack Files supported - MP3, WMA (non encrypted), WAV audio; AMV video, JPG pictures Operating System Support - Win2k/XP/Vista/Win7 and Mac OS 10.4 or later